LogDebug is a helper function to make sure logging output conforms to logging format standard.

LogError is a helper function to make sure logging output conforms to logging format standard.

Logf is a helper function to write directly to output without fields.

LogFatal is a helper function to make sure logging output conforms to logging format standard.

LogInfo is a helper function to make sure logging output conforms to logging format standard.

Logln is a helper function to write directly to output without fields.

LogWarn is a helper function to make sure logging output conforms to logging format standard.

SetLevel is to set logger level verbosity.